MULTIPLY WHOLE NUMBERS, PROBLEMS
a) In the partial product 852, in which place is 2? To see the answer, pass your mouse over the colored area. Tens. Why? Because we multiplied by 4 tens. b) In the partial product 639, in which place is 9? Hundreds. Why? Because we multiplied by 3 Hundreds. a) 8 × 9 = 72. What does the carried 7 signify? 7 tens. b) 8 × 5 = 40, plus 7 = 47.
What does the carried 4
b) Why? Because we are multiplying 8 × 5 tens = 40 tens, plus 7 tens = 47 tens = 470.
Multiplying decimals 5. 23 × 584 = 13432. 18. Therefore,
5. b) .0023 × 5.84 = .013432 6. a) If we ignore the decimal point in 4.58 and consider it as 458, what Multiplied by 100. 6. b) If we separate two decimal places in 458 so that it becomes 4.58, Divided by 100. 7. Do not calculate vertically. Just write the answer.
8. Do not calculate vertically. 11. a) 200 × 1.6 200 × 16 = 3200. 200 × 1.6 = 320.0 = 320 11. b) 3000 × .07 = 210 11. c) 50 × .11 = 5.5 d) .008 × 900 = 7.2 11. e) .6 × 7000 = 4200 f) .0003 × 25,000 = 7.5
4.75 × 60 minutes = 285 minutes 10. A photocopy costs 3 cents a sheet. If a business makes 12,000 copies 3 × 12,000 = 36,000. $.03 × 12,000 = $360.00 11. Jane earns $7.50 an hour. What is her pay for a 40 hour week? $300 11. What is her yearly pay? 52 × $300 = $15,600 12. The circumference of a circle C is related to the diameter D as C = 3.14 × D How long is the circumference if the diameter is 1.6 inches? 3.14 × 1.6 = 5.024 inches 13. Calculate the area of a rectangle whose base is 2.5 cm and whose 2.5 cm × .38 cm = 0.95 cm² 14. How much is
Continue on to the next Lesson. or Return to the previous section. Please make a donation to keep TheMathPage online. Copyright © 2001-2007 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |